期刊
APPLIED PHYSICS LETTERS
卷 101, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4743010
关键词
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资金
- NSF [DMR-0547036]
- Department of Energy [DE-SC0002623]
Canier-dopant exchange interactions in Mn-doped PbS colloidal quantum dots were studied by circularly polarized magneto-photoluminescence. Mn substitutional doping leads to paramagnetic behavior down to 5 K. While undoped quantum dots show negative circular polarization, Mn doping changes its sign to positive. A circular polarization value of 40% was achieved at T = 7 K and B = 7 tesla. The results are interpreted in terms of Zeeman splitting of the band edge states in the presence of carrier-dopant exchange interactions that are qualitatively different from the s,p-d exchange interactions in II-VI systems. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4743010]
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